Effect of the resonance of the C–H and O–H bond stretching vibrations on the IR spectra of the hydrogen bond in formic and acetic acid

2011 ◽  
Vol 79 (5) ◽  
pp. 1276-1284 ◽  
Author(s):  
Henryk T. Flakus ◽  
Barbara Hachuła
Keyword(s):  
Hydrogen Bond ◽  
Acetic Acid ◽  
Ir Spectra ◽  
Bond Stretching ◽  
Stretching Vibrations

Theory of profiles of hydrogen bond stretching vibrations: Fermi–Davydov resonances in hydrogen-bonded crystals

2004 ◽  
Vol 306 (1-3) ◽  
pp. 57-70 ◽  
Author(s):  
A.M. Yaremko ◽  
H. Ratajczak ◽  
J. Baran ◽  
A.J. Barnes ◽  
E.V. Mozdor ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Bond Stretching ◽  
Stretching Vibrations ◽  
Hydrogen Bonded

Polarized IR spectra of the hydrogen bond in acetic acid crystals

2007 ◽  
Vol 336 (1) ◽  
pp. 36-50 ◽  
Author(s):  
Henryk T. Flakus ◽  
Aleksandra Tyl
Keyword(s):  
Hydrogen Bond ◽  
Acetic Acid ◽  
Ir Spectra

Intermolecular hydrogen bond stretching vibrations observed in terahertz spectra of crystalline vitamins

CrystEngComm ◽  
2018 ◽  
Vol 20 (14) ◽  
pp. 1960-1969 ◽  
Author(s):  
Masae Takahashi ◽  
Nobuyuki Okamura ◽  
Xiaomeng Ding ◽  
Hitoshi Shirakawa ◽  
Hiroaki Minamide
Keyword(s):  
Hydrogen Bond ◽  
Intermolecular Hydrogen Bond ◽  
Bond Stretching ◽  
Stretching Vibrations

Intermolecular hydrogen bond stretching vibrations in the crystal of vitamins has several specific properties in the THz spectrum.

Contributions to Silicon-Hydrogen Bond-Stretching Frequency in Amorphous Si Alloys

1992 ◽  
Vol 258 ◽  
Author(s):  
Z. Jing ◽  
J. L. Whitten ◽  
G. Lucovsky
Keyword(s):  
Experimental Data ◽  
Hydrogen Bond ◽  
Dielectric Constant ◽  
Ab Initio ◽  
Effective Dielectric Constant ◽  
Bond Energies ◽  
Calculated Frequency ◽  
Bond Stretching ◽  
Amorphous Si ◽  
Good Agreement

ABSTRACTWe have performed ab initio calculations and determined the bond-energies and vibrational frequencies of Si-H groups that are: i) attached to Si-atoms as their immediate, and also more distant neighbors; and ii) attached to three O-atoms as their immediate neighbors, but are connected to an all Si-atom matrix. These arrangements simulate bonding geometries on Si surfaces, and the calculated frequency for i) is in good agreement with that of an Si-H group on an Si surface. To compare these results with a-Si:H alloys it is necessary to take into account an additional factor: the effective dielectric constant of the host. We show how to do this, demonstrating the way results of the ab initio calculations should then be compared with experimental data.

Preparation and Research of Polymolybdate/Polymer Composite Membrane by Electrospinning and its Photo-Catalytic Property

2013 ◽  
Vol 395-396 ◽  
pp. 415-418
Author(s):  
Zhi Ming Zhang ◽  
Ting Ting Li ◽  
Ce Liu
Keyword(s):  
Hydrogen Bond ◽  
Ir Spectra ◽  
Composite Membrane ◽  
Phosphomolybdic Acid ◽  
Uv Spectra ◽  
Polarizing Microscopy ◽  
Optimum Parameters ◽  
Anhydrous Alcohol ◽  
Cellulosic Membrane ◽  
Strong Absorption Peak

Composite cellulosic membrane of PMMA and phosphomolybdic acid was prepared by electrospinning. During the progress, the factor of electrospinning and the optimum parameters was found out within the orthogonal combination experiment program. Then the morphology of the composite cellulosic membrane was observed by polarizing microscopy. To resolve PMMA, DMF and anhydrous alcohol were used. When their ratios were 1:1, the diameter of the fibre was the most homogeneous. During the electrospinning, the concentration of PMMA was the most important factor. When the concentrations were less then 10%, there were hardly fibres on the foil. The diameter of the fibre ranged from 0.5 to 1.2 μm along with the increment of the concentration of PMMA. The addition of phosphomolybdic acid made the diameter of the fibre decrease. IR-spectra showed that phosphomolybdic acid kept its Keggin structure, and it interacted with PMMA through hydrogen bond. The composite cellulosic membrane changed its color when imposed in bright space. UV spectra represented that the composite cellulosic membrane had a strong absorption peak at 700nm.

scholarly journals Synthesis and Characterization of Some Novel Oxazine, Thiazine and Pyrazol Derivatives

2016 ◽  
Vol 13 (2) ◽  
pp. 244-252
Author(s):  
Baghdad Science Journal
Keyword(s):  
Acetic Acid ◽  
Ir Spectra ◽  
Glacial Acetic Acid ◽  
Basic Medium ◽  
Synthesis And Characterization ◽  
Pyrazole Derivatives ◽  
Phenyl Hydrazine ◽  
H Nmr ◽  
Ft Ir

In this paper, some chalcone derivatives (C1, C2) were synthesized based on the reaction of equal amount of substituted acetophenone and substituted banzaldehyde in basic medium. Oxazine and thiazine derivatives were prepared from the reaction of chalcones (C1-C2) with urea and thiourea respectively in a basic medium. Pyrazole derivatives were prepared based on the reaction of chalcones with hydrazine mono hydrate or phenyl hydrazine in the presence of glacial acetic acid as a catalyst. The new synthesized compounds were identified using various physical techniques like1 H-NMR and FT-IR spectra.

scholarly journals A new solvate of epalerstat, a drug for diabetic neuropathy

2017 ◽  
Vol 73 (8) ◽  
pp. 1264-1267 ◽  
Author(s):  
Okky Dwichandra Putra ◽  
Daiki Umeda ◽  
Kaori Fukuzawa ◽  
Mihoko Gunji ◽  
Etsuo Yonemochi
Keyword(s):  
Hydrogen Bond ◽  
Acetic Acid ◽  
Carboxylic Acid ◽  
Hydrogen Bonds ◽  
Diabetic Neuropathy ◽  
Dihedral Angle ◽  
Phenyl Ring ◽  
Acid Moiety ◽  
Acta Cryst ◽  
Carboxylic Acid Groups

Epalerstat {systematic name: (5Z)-5-[(2E)-2-methyl-3-phenylprop-2-en-1-ylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidine-3-acetic acid} crystallized as an acetone monosolvate, C15H13NO3S2·C3H6O. In the epalerstat molecule, the methylpropylenediene moiety is inclined to the phenyl ring and the five-membered rhodamine ring by 21.4 (4) and 4.7 (4)°, respectively. In addition, the acetic acid moiety is found to be almost normal to the rhodamine ring, making a dihedral angle of 85.1 (2)°. In the crystal, a pair of O—H...O hydrogen bonds between the carboxylic acid groups of epalerstat molecules form inversion dimers with an R 2 2(8) loop. The dimers are linked by pairs of C—H...O hydrogen bonds, enclosing R 2 2(20) loops, forming chains propagating along the [101] direction. In addition, the acetone molecules are linked to the chain by a C—H...O hydrogen bond. Epalerstat acetone monosolvate was found to be isotypic with epalerstat tertrahydrofuran solvate [Umeda et al. (2017). Acta Cryst. E73, 941–944].

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